The average age of a family of 6 members 4 years ago was 25 years. Meanwhile a child was born in this family and still the average age of the whole family is same today. The present age of child is ......

2 years

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1 \frac{1}{2}

years

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1 years

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Data insufficient

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Solution

The correct option is C 1 years
Total age of 6 family members four year ago = $25 \times 6 = 150$ years
Total age of 6 family member now=150+ $4 \times 6 = 150 + 24 = 174$ years
Total age of 6 family member and child = $25 \times 7 = 175$ year
Age of child =175-174=1 year

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The average age of a family of 6 members 4 years ago was 25 years. Meanwhile a child was born in this family and still the average age of the whole family is same today. The present age of child is ......

The correct option is C 1 yearsTotal age of 6 family members four year ago =25×6=150yearsTotal age of 6 family member now=150+4×6=150+24=174yearsTotal age of 6 family member and child =25×7=175yearAge of child =175-174=1 year

The correct option is C 1 years
Total age of 6 family members four year ago = $25 \times 6 = 150$ years
Total age of 6 family member now=150+ $4 \times 6 = 150 + 24 = 174$ years
Total age of 6 family member and child = $25 \times 7 = 175$ year
Age of child =175-174=1 year